Question

I’m doing a steganography project where I read in bytes from a ppm file and add the least significant bit to an array. So once 8 bytes are read in, I would have 8 bits in my array, which should equal some character in a hidden message. Is there an easy way to convert an array of 0’s and 1’s into an ascii value? For example, the array: char bits[] = {0,1,1,1,0,1,0,0} would equal ‘t’. Plain C

Thanks for all the answers. I’m gonna give some of these a shot.

Answer 1

A simple for loop would work – something like

    unsigned char ascii = 0;
    unsigned char i;

    for(i = 0; i < 8; i++)
       ascii |= (bits[7 - i] << i);

There might be a faster way to do this, but this is a start at least.